print("Tunnel has started.")

io.write("Please enter the width, in number of blocks, to dig: ")
width = io.read()

io.write("Please enter the height, in number of blocks, to dig: ")
height = io.read()

io.write("Please enter the depth, in number of blocks, to dig: ")
depth = io.read()

print("Tunnel will run with parameters width = " .. width .. ", height = " .. height .. ", and depth = " .. depth .. ".")

intWidth = tonumber(width)

for i = 1, tonumber(depth) do
  currentDug = 0
  for i = 1, tonumber(height) do
    while (currentDug < intWidth) do
      turtle.dig()
      currentDug = currentDug + 1
      turtle.forward()
      if (currentDug == intWidth and i ~= tonumber(height)) then
        turtle.digUp()
        currentDug = 1
        turtle.up()
        turtle.turnLeft()
        turtle.turnLeft()
        break
      end
    end
  end
  for i = tonumber(height) - 1, 1, -1 do
    turtle.down()
  end
  if (i ~= tonumber(depth)) then
    turtle.forward()
    turtle.turnLeft()
    turtle.dig()
    tuirtle.forward()
    turtle.turnLeft()
  end
end

turtle.turnRight()

for i = 1, tonumber(depth) do
  turtle.forward()
end

turtle.turnRight()

for i = 1, tonumber(width) do
  turtle.forward()
end